Can't get ImGui to draw OVER my OpenGL stuff

[oxysoft]

Here is a relevant excerpt from my code

bool OpenglContext::Start(const std::string& title, int width, int height, bool isFullscreen)
{
	m_windowTitle = title;
	m_isFullscreen = isFullscreen;
	InitWindow(width, height);
	ImGui::SFML::Init(m_window);

	Init();
	LoadResource();
	ShowCursor();

	sf::Clock clock;
	while (m_window.isOpen())
	{
		m_window.setActive();
		sf::Event event;
		while (m_window.pollEvent(event))
		{
			ImGui::SFML::ProcessEvent(event);

			switch (event.type)
			{
				case sf::Event::Closed:
					m_window.close();
					break;

				case sf::Event::Resized:
					OnWindowResized(event.size.width, event.size.height);
					break;

				case sf::Event::KeyPressed:
					OnKeyPress(event.key.code);
					break;

				case sf::Event::KeyReleased:
					OnKeyRelease(event.key.code);
					break;

				case sf::Event::MouseMoved:
					OnMouseMove(event.mouseMove.x, event.mouseMove.y);
					break;

				case sf::Event::MouseButtonPressed:
					OnMousePress(ConvertMouseButton(event.mouseButton.button), event.mouseButton.x,
					             event.mouseButton.y);
					break;

				case sf::Event::MouseButtonReleased:
					OnMouseReleased(ConvertMouseButton(event.mouseButton.button), event.mouseButton.x,
					                event.mouseButton.y);
					break;

				case sf::Event::MouseWheelMoved:
					if (event.mouseWheel.delta > 0)
						OnMousePress(MOUSE_BUTTON_WHEEL_UP, event.mouseButton.x, event.mouseButton.y);
					else
						OnMousePress(MOUSE_BUTTON_WHEEL_DOWN, event.mouseButton.x, event.mouseButton.y);
					break;

			}
		}

		ImGui::SFML::Update(m_window, clock.restart());
		ImGui::Begin("MyWindow"); // begin window
		ImGui::Button("wow!");
		ImGui::End(); // end window

		m_window.clear(sf::Color(30, 30, 30));
		m_window.resetGLStates();
		// Uncommenting the two lines below replaces everything with my game.
//		Init();
//		Render(m_lastFrameTime);

		ImGui::SFML::Render(m_window);
		m_window.display();
		m_lastFrameTime = clock.getElapsedTime().asSeconds();

		// Handle ourself frame rate limit, sf::Window::setFramerateLimit doesn't seems to work
		float waitTime = (1.f / m_maxFps) - m_lastFrameTime;
		if (waitTime > 0)
		{
			sf::sleep(sf::seconds(waitTime));

			m_lastFrameTime = clock.getElapsedTime().asSeconds();
		}
	}

	UnloadResource();
	DeInit();

	ImGui::SFML::Shutdown();
	return true;
}

The two commented lines prepare the GL context (enable depth test, etc.) and then draws the entirety of my game. If I keep these lines commented, I can see my ImGui window with a button in it. If I comment out these lines, ImGui is nowhere to be seen.

What gives?

1. I update ImGui and send some stuff to it.
2. Render my game.
3. Render ImGui with ImGui::SFML::Render
4. Send to the screen with RenderWindow::Display

What am I missing?

[eliasdaler]

Hello
It'll help me a lot if you'll find a very simple compilable example. Even if it's pretty big, but is one file that I can compile - it'll help a lot. I'm not doing 3D graphics, so I'm not sure what can cause the problem, unfortunately.

Also take a look at "RenderDrawLists" in imgui-SFML.cpp - I think there might be some glEnable/glDisable calls which I've missed and which screw up the OpenGL state.

[eliasdaler]

Might be related to #159, might be fixed in one of the latest versions... Feel free to reopen if needed.